Die set



K;-- JANISZEWSKI DIE SET Sept. 23, 1952 Filed May 24, 194s 2SHEETS-SHEET 1 BY M, M m ATTORNEYS:

INVENTOR KQSIM /P J/I/v/JZEMJK/ Sept. 23, 1952 K. 'JANISZEWSKI DIE SET 2SHEETS-SHEET 2 Filed May 24, 1946 INVENTOR KQJ/M/R JAMJZEWsx/ A-rroRNEYsPatented Sept. 23, 1952 DIE SET Kasimir J aniszewski, Milwaukee, Wis.,assignor to Superior Steel Products Corp., Milwaukee, Wis., acorporation of Wisconsin Application May 24, 1946, Serial No. 672,053

This invention relates to improvements in die sets.

It is a primary object of the invention to provide increased accuracy ofguidance between the .punch carrying platen and the bed. plate of a diepin and bushing are polygonal in cross section (preferably triangular)thereby providing flat bearing surfaces as distinguished from the linebearing contact between cylindrical pins and bushings.

Economy is attributable to the following facts: First, the polygonalform of th leader pin and bushing makes it possible, in a small die set,to use a single leader pin rather than two or more. Seeondly, the dieset may be fabricated with considerable saving in material cost andlabor as compared with conventional methods of cutting plates andforming and mounting leader pins and bushings. Thirdly, the presentinvention contemplates means whereby adjustments may be made tocompensate for wear so that the life of the die set may be indefinitelyprolonged. Fourth, my improved leader pin construction lends itself tomass production as distinguished from the individual attention requiredby leader pins previously used. Fifth, my improved die set may bereadily salvaged and converted to a different usage.

A further object of the invention is to provide a new and improvedlubricating arrangement for the surfaces of the leader pin and bushing.

Still another object of the invention is to provide novel and improvedmeans for handling the die set or bed plate made in accordance with thepresent invention. Other objects will beapparent to those skilled in theart upon analysis of the following disclosure.

In the drawings:

Fig. 1 is a plan view of the die plate of the die set embodying thepresent invention, the leader pin being shown in section and portions ofthe bed plat being broken away.

Fig. 2 is a view partially in side elevation and.

partially in section through a completed die set including the bed plateshown in Fig. 1.

Fig. 3 is a fragmentary viewin rear elevation of the die set shown inFig. 2.

Fig. 4 is a fragmentary detail view in perspective showing the leaderpin employed in the die set of Figs. 1, 2 and 3.

Fig. 5 is a view in plan of the end of a piece 0 angle stock from whichmy improved leader pin may be formed.

7 Claims. (Cl. 164118) Fig. 6 is a plan view showing an intermediatestep in the process of making the leader pin.

Fig. '7 is a view in horizontal cross section through the completedleader pin.

Fig. 8 is a view partially in plan and partially in section showing amodified embodiment of leader pin mounted in the die set.

Fig. 9 is a plan view of a further modified leader pin arrangement.

Fig. 10 is a view partially in end elevation and partially in sectionshowing 9, grinding operation performed in the completion of leader pinsin accordance with the present invention.

Fig. 11 is a view similar to Fig. 10 showing a further grindingoperation.

While a die set embodying th present invention may be provided with anydesired number of leader pins, I have selected as an embodiment of theinvention a die set'using a single leader pin to exemplify the factthatthe invention makes it possible to use a single leader pin in place oftwo or more as heretofore required.

The shoe or bed plate l5 andthe punch carrier or platen I6 are guidedfor relative reciprocation by the leader pin I! which, for purposes ofthe present invention, is polygonal in cross section. I have found itdesirable to employ a leader pin of triangular cross section, as shown,in preference to the various other polygonal forms which I have tested,as the triangular form gives great stability combined with maximumbearing surface area so disposed in a minimum number of plane surfacesas to resist torsion or displacement of plates l5, 16, in the course oftheir relative movement.

While the leader pin is ordinarily fixed to the bed plate, the platenbeing slidable thereon, the manner in which the respective plates areconnected to the leader pin may be very imilar.

The upper and lower plates I5 and 16 of the die set are both providedwith receptacles corresponding in cross section to the selectedpolygonal form of the leader pin. Each receptacle preferably has aremovable wall whereby the leader pin I! may be clamped, in the case ofthe bed plate, and slidably positioned with respect to the movable plateor platen. In the construction shown in Fig. 1, the receptacle isfabricated by welding end bars l8, l9 and gussets 20, 2| to the rearmargin of the bed'plate [5, the bars meeting each other at an acuteangle and providing surfaces complementary to two surfaces of the leaderpin [1. The third wall'of the receptacle is provided by a closure plate22 held by cap screws 23 in clamping relation to th'e third side of theleader pinl'l. V 1

interior section of an isosceles triangle.

As shown in Figs. 2 and 3, the receptacle in which the leader pin slidesduring vertical reciprocation of the platen I6 may be made identicallyand connected with the platen l6 identically in the manner abovedescribed, the only difference between the two receptacles being in theprovision of sufficient clearance between leader pin and the bearingsurfaces of one of the receptacles to permit freedom of slidingmovement. This may be done in the machining of the rear margins of thereceptacle forming walls I8, l9 or, if these parts are identical asbetween the platen and bed plate, shims may be inserted for the supportof the closure plate 22 of the receptacle at the rear of the platen.

In any event, it will be apparent that the bearing pressure or clampingpressure, developed by the closure plate 22 will be applied uniformly tothe three sides or faces of the leader pin I1 and the entire areas ofthe leader pin within the receptacle may readily be made subject touniform bearing contact, the device being thereby sharply distinguishedfrom a cylindrical surface in which only line contact is possible.Because of the large areas in contact a single leader pin will sufficefor a small die set as shown in Fig. 1 and will resist torsionaldisplacement of the platen and assure free sliding movement of theplaten vertically with respect to the bed plate.

Assuming the leader pin I! to be hollow, as shown, it may veryconveniently be lubricated by inserting a plug 24 in its hollow interiorand putting oil or other lubricant into a wick 25 supported by the plug.Openings at 26 communieating with grooves 21 in the exterior faces oftheleader pin permit the oil to flow as needed to the bearing surfaces ofthe receptacle.

The leader pin may be solid as indicated at H in Fig. 8, but ispreferably fabricated. Starting with the piece of 90 angle stock shownat 28 in Fig. 5, I form the angle in a die to reduce it to 60 as shownat 29 in Fig. 6. Thereupon I weld the back plate 30 to the margin of theangle so that the resulting hollow bar has the The sides are thensurfaces to include the projecting corners and to make up the leader pinI! as shown in Fig. '7, the apices at 3|, 32 and 33 preferably beingslightly relieved by being rounded as shown.

The receptacle for any type of leader pin need not be fabricated in themanner shown in Fig. 1, but may comprise, in whole or part, surfaces ofthe bed plate l5 or the die carrying shoe I8, as the case may be. Forexample, I have shown in Fig. 8 a receptacle made by welding at 34 tothe plate 5 a strip of metal 35 bent to the shape of an inverted V andhaving an offset end 36 held by screw 31 to plate 15. The release ofscrew 31 relaxes the pressure ofthe strip of metal 35 upon the leaderpin ll, thereby permitting insertion or replacement of such pin.Tightening of screw 31 firmly clamps the pin to plate I5, the edge ofthe plate forming one lapped face of the triangular. clamp in which theleader pin I7 is held.

Another example is shown in Fig. 9 where the die carrying shoe plate [6is provided with a V-shaped notch at 38 preferably equipped with ahardened liner 39 for the leader pin ll. closure plate 22 is bolted tothe shoe l6 across the notch, thereby completing a triangular bearingwhich serves as a bushing but provides three The planiform bearingsurfaces slidable upon the leader pin l1.

In Figs. 10 and 11, I have shown operations in the grinding of leaderpins embodying this invention. The flat faces of these pins facilitatefabrication, machining and finishing. In Fig. 10, a number of the leaderpins I! are carried side by side on a fixture 40 and a grinding wheel 4|having a pair of angularly beveled faces is simultaneously finishing theopposing faces of two of the leader pins. If it be desired to finish thefaces of the leader pins individually, this may be done by thecylindrical wheel 42, as shown in Fig. 11. Whatever the method ofproduction used, the fact that the leader pins are polygonal in crosssection assures large areas of contact and the triangular cross sectionis particularly desirable because the bearing pressure may, by a varietyof mechanical expedients, be closely regulated to give accurate guidancefor the relative reciprocation of the die plates with no more frictionthan is required for accuracy.

To facilitate the anchorage as well as the transportation of my improveddie set, I prefer to provide the plate 5 with fabricated ears which arespaced in pairs at opposite ends of the plate, as best shown in Fig. 1.Each of-these ears is made by bending a piece of bar stock into a broadU, as indicated at 46, welding its ends to the ends of the plate l5 andthereafter welding to the plate and the bar a cover member 41. Thiscover member preferably overhangs its hollow support 46 in the mannershown in Figs. 1, 2 and 3, thereby facilitating the introduction of aT-headed lifter beneath flanges 41. At the same time, the space at 48between the pairs of ears receives a tension bolt by means of which thebed plate may be firmly anchored on its bench or frame.

I claim:

1. As a new article of manufacture, a die set plate provided with aleader pin receptacle having flat interior surfaces arranged inpolygonal outline, said receptacle comprising at least one relativelymovable wall providing one of said fiat surfaces, a portion of saidreceptacle, including at least the said movable wall, being outside ofthe outline of said plate.

2. As a new article of manufacture, a die set plate provided with aleader pin receptacle having flat interior surfaces arranged inpolygonal outline, said plate having surfaces providing at least one ofthe faces of said receptacle, other faces of -said receptacle beinprovided by a bar welded at one end to said plate and having areleasable screw connection at its other end with said plate.

3. As a new article of manufacture, a die set plate provided with aleader pin receptacle having fiat interior surfaces arranged inpolygonal outline, said receptacle comprising two angularly relatedfaces notched into said plate and a closure spanning the notch andproviding a third face for said receptacle, said closure having meansconnecting it with said plate.

4. A die set comprising relatively movable plates, a single prismaticleader pin fixed to one of said plates, the other plate being providedwith a receptacle having flat faces complementary to said leader pin andin fiat face bearing contact with said leader pin whereby said singlepin provides guidance for the relative reciprocation of said plates andresists torsional displacement of one of said plates respecting theother, said leader pin and receptacle being of triangular cross sectionand said receptacle comprising one relatively movable wall, and meansfor tightening said wall toward said leader pin whereby to establishbearing contact on all three faces of the leader pin.

5. A die set comprising in combination a leader pin of triangularsection and a receptacle of complementary section having first andsecond walls and a third relatively adjustable wall, together with meansfor tightening the relatively adjustable wall toward at least one ofsaid other walls, whereby to develop pressure bearing contact ensuringthe bearing of all three faces of the leader pin against all three facesof the bearing pressure developed by the adjustment of the movableportion of the receptacle will be distributed between all of the bearingfaces of the leader pin and receptacle.

KASIMIR J ANISZE'WSKI.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 99,149 Burke Jan. 25, 1870312,643 Knox Feb. 24, 1885 1,423,917 Dismont July 25, 1922 1,568,017Danly Dec. 29, 1925 1,921,421 Marsilius Aug. 8, 1933 2,422,775 ConnorJune 24, 1947 FOREIGN PATENTS Number Country Date France Sept. 25, 1933

